GEOMETRIC ERROR IDENTIFICATION METHOD OF MULTI-AXIS MACHINE TOOL AND MULTI-AXIS MACHINE TOOL

摘要

A geometric error identification method of multi-axis machine tool includes a measuring step of indexing a position of a target ball mounted on one of a main spindle and a table into a plurality of angles around an rotation axis, and measuring the position of the target ball at respective indexed positions by using a touch probe mounted on the other one of the main spindle and the table, a geometric error calculation step of calculating a geometric error from the measured position of the target ball, an ellipse-expression calculation step of calculating an ellipse approximate expression by an arc trajectory measured by operating the rotation axis, and an error correcting step of calculating and correcting a scaling error of translation axes from the calculated ellipse approximate expression.

主权项

1. A geometric error identification method of a multi-axis machine tool including a main spindle on which a tool can be mounted and a table on which a workpiece is retained configured to move relative to each other by a control device via two or more translation axes and at least one rotation axis so that the workpiece is machined with the tool, the method being a method of identifying a geometric error relating to the translation axes and the rotation axis and correcting a scaling error of the translation axes by the control device of the multi-axis machine tool, the method comprising:
a measuring step of indexing a position of a measured jig mounted on one of the main spindle and the table into a plurality of angles around the rotation axis, and measuring the position of the measured jig at indexed positions by using a position measuring sensor mounted on the other one of the main spindle and the table; a geometric error calculation step of calculating a geometric error from the measured position of the measured jig; an ellipse-expression calculation step of calculating an ellipse approximate expression by an arc trajectory measured by operating the rotation axis, and an error correcting step of calculating and correcting the scaling error of the translation axes from the calculated ellipse approximate expression.